
/**
 * STM32cubeMX 基于stm32的定时器实现定时1秒LED闪烁。
 * https://blog.csdn.net/huluwadeyeye/article/details/82632102
  */
#include "main.h"

TIM_HandleTypeDef _tim1;
UART_HandleTypeDef _uart2;
static GPIO_InitTypeDef GPIO_InitStruct;

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_TIM1_Init(void);

static void MX_USART2_UART_Init(void);

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *tim);

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void) {

    HAL_Init();

    SystemClock_Config();

    MX_GPIO_Init();
    MX_TIM1_Init();
    MX_USART2_UART_Init();

    /* USER CODE BEGIN 2 */
    HAL_TIM_Base_Start_IT(&_tim1);
    /* -1- Enable GPIO Clock (to be able to program the configuration registers) */
    LED2_GPIO_CLK_ENABLE();

    /* -2- Configure IO in output push-pull mode to drive external LEDs */
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

    GPIO_InitStruct.Pin = LED2_PIN;
    HAL_GPIO_Init(LED2_GPIO_PORT, &GPIO_InitStruct);

    while (1) {
    }
}

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *tim) {
    if (tim->Instance == TIM1) {
        /* Toggle LED */
        HAL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
    }
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void) {
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /** Initializes the RCC Oscillators according to the specified parameters
    * in the RCC_OscInitTypeDef structure.
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
        Error_Handler();
    }
    /** Initializes the CPU, AHB and APB buses clocks
    */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                  | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
        Error_Handler();
    }
}

/**
  * @brief TIM1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM1_Init(void) {

    TIM_ClockConfigTypeDef sClockSourceConfig = {0};
    TIM_MasterConfigTypeDef sMasterConfig = {0};

    /*
     * 由于TIM1是挂在APB2总线上（如何判断当前计时器在哪个总线，文章最后会描述方法），查看时钟树我们知道APB2当前频率为72MHz，
     * 我们希望每秒钟发生2次中断，就把预分频系数设置为36000-1，自动重载值为1000-1，
     * 得到的计时器更新中断频率即为72,000,000/36000/1000=2Hz。此时定时为0.5秒，若要实现定时1秒，则将1000改为2000
     */
    _tim1.Instance = TIM1;
    _tim1.Init.Prescaler = 36000 - 1;
    _tim1.Init.CounterMode = TIM_COUNTERMODE_UP;
    _tim1.Init.Period = 200 - 1;
    _tim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    _tim1.Init.RepetitionCounter = 0;
    _tim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
    if (HAL_TIM_Base_Init(&_tim1) != HAL_OK) {
        Error_Handler();
    }
    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
    if (HAL_TIM_ConfigClockSource(&_tim1, &sClockSourceConfig) != HAL_OK) {
        Error_Handler();
    }
    sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if (HAL_TIMEx_MasterConfigSynchronization(&_tim1, &sMasterConfig) != HAL_OK) {
        Error_Handler();
    }
}

/**
  * @brief USART2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART2_UART_Init(void) {
    _uart2.Instance = USART2;
    _uart2.Init.BaudRate = 115200;
    _uart2.Init.WordLength = UART_WORDLENGTH_8B;
    _uart2.Init.StopBits = UART_STOPBITS_1;
    _uart2.Init.Parity = UART_PARITY_NONE;
    _uart2.Init.Mode = UART_MODE_TX_RX;
    _uart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    _uart2.Init.OverSampling = UART_OVERSAMPLING_16;
    if (HAL_UART_Init(&_uart2) != HAL_OK) {
        Error_Handler();
    }
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void) {
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    /* GPIO Ports Clock Enable */
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();

    /*Configure GPIO pin Output Level */
    HAL_GPIO_WritePin(BlueLed_GPIO_Port, BlueLed_Pin, GPIO_PIN_SET);

    /*Configure GPIO pin Output Level */
    HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);

    /*Configure GPIO pin : BlueLed_Pin */
    GPIO_InitStruct.Pin = BlueLed_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(BlueLed_GPIO_Port, &GPIO_InitStruct);

    /*Configure GPIO pin : LD2_Pin */
    GPIO_InitStruct.Pin = LD2_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void) {
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
